木豆属（学名：Cajanus）是蝶形花科下的一个属，为直立小灌木植物。该属共有2种，分布于热带非洲和亚洲。

The genus Cajanus is a member of the plant family Fabaceae. There are 37 species, mainly distributed across Africa, Asia and Australasia.

Species include the pigeon pea (C. cajan).

Cajanus species are used as food plants by the larvae of some Lepidoptera species including Endoclita malabaricus.